Air-cooled internal-combustion motor



April 22 1924. 1,491,584

W. CONNOR ATR COOLED INTERNAL COMBUSTION MOTOR Filed April 4. 1922 EYMQLM Patented Apr. 22, 1924.

WALTER CONNOR, F iVINlDSOR, ONTARIO, CANADA.

AIR-COOLED INTERNAL-COMBUSTION MOTOR.

Application filed April 4,

To all who t may concern.'

Be it known that I, WALTER CONNOR, of the city of lVindsor, in the county of Essex, Province of Ontario, Canada, a'subject of the King of Great Britain, have invented certain new and useful Improvements in Air-Cooled Internal-Combustion Motors, of which the following is a specification.

This invention relates to motors which are cooled by the passage of air over the surface of the partsr thereof which 4become heated while the motor is in operation.

It is well recognized that it is desirable that the cooling should not be carried to such an extent as to lower the thermal efficiency of the motor, and also that the extent of the cooling should be regulable in accordance with the load and therefore the fuel consumption of the motor, and my object therefore is to devise efficient means for cooling the engine by air and to provide inrans for automatically regulating the degree of cooling in accordance with the fuel consumption.

I attain my object by means of the constructions hereinafter described and illus- `trated in the accompanying drawings in which- Fig. 1 is a side elevation of an internal combustion motor constructed in accordance with my invention;

Fig. 2 an end view, partly in section of the same;

Fig. 3 a cross section on the line a-b in F ig. 2 of the cylinder of the motor; and

F ig. 4 a sectional detail on a larger scale of the cylinder taken in a plane at right angles to Fig. 1.

In the drawings like numerals of reference indicate corresponding parts in the diiferent figures.

While the invention is shown in Fig. 1 as applied to a single cylinder motor, it will be understood, of course, that it is equally applicable to multi-cylinder motors.

1 is the crank case Iof the motor, to which the cylinder 2 is connected in any ordinary manner. To the upper end of the cylinder is connected a valve casing 3, which is divided by a partition 4 into an exhaust chamber 5 and an inlet chamber 6. With these chambers will connect the usual intake and 1922. serial No. 549,505.

either becast integral with the walls and of the same material as the walls, b-ut are preferably formed of sheet steel and have their inner edges cast into the walls of the cylinder and valve casings. The ribs of the valve casing will, of course, be separate from those of the cylinder as the valve casing is removable.

The valve casing is provided with long bearings 8 for the valve stems. Surrounding the cylinder, the valve casing and the ribs is a casing 9 which preferably fits close to the `outer edges of the ribs. This casing is open at the upper end or is otherwise provided with an exit for air.k The lower end of the casing is closed save for an inlet opening communicating with the discharge outlet 10 `of a rotary air pump 11. This air pump is driven by a shaft 12 driven in any suitable manner from the crank shaft of the motor, as, for example, by the sprocket gearing 13. This air pump is provided with a shutter 14 adapted to regulate the inflow of air through the eye or inlet opening 15 of the air pump. This shutter is preferably formed as a plate with a concavely curved forward `edge 16 and is pivoted at 17 to the fan casing or other stationary part. .This shutter will never be entirely closed, preferably at any,

time leaving about half the area of the inlet opening 15 uncovered, while it may be swung to completely uncover said'inlet opening. The pivot of this shutter is preferably formed as a spindle journaled in the fan casing and having a rock arm 18 secured thereto by means of which the shutter may be actuated from any part of any suitable mechanism adapted to control the throttle opening of the Carburettor or other vfuel supp-lying attachment ofthe motor.

I preferably employ to actuate the shutter a rod 19 slidably supported in lugs 20.

On lthe rod is secured a ixedcollar 21 and an adjustable collar 22, .which maybe moved however, that if the throttle be opened Widely, the shutter will be moved substantially to the Wide open position, While 4when the throttle is moved tovvards the closed position. the shutter will be: movedY to apredetermined position cutting dovvnthe airnto a predetermined minimum.

By adjusting the collar 22, the opening of the shutter may be adjusted to suit diiferences in climatic conditions which may require the motor to be cooled to a greater or less degree. Y

It Will be noted that the floor of the exhaust chamber is Vprovided withY ribs 28 which are in conducting contact or connection With the iioor of the chamber and the outer Wall thereof. These ribs are effective in conducting'heat to the outer Walls for radiation therefrom orYV for conduction to the fins orribs. The exhaust valve stem guide 29 is exposed as Will be seen on reference te Figs. Sand i to the cooling action of the entering charge. f

FromY the above .description it Willbe seen that theV combustion chamber of the cylinder is cooled first by the incoming charge, second by the expansion of the exhaust gases in the exhaust chamber, third by the division Wall between the inlet and exhaust chambers and the ribs which conduct the heat to the outside Wall of VVthe exhaust chamber, and fourth, by the radiation from the external fins and ribs over Which the current of air from the :fan passes.

As there are no moving parts in the cylinder head requiring lubrication, and the Walls of the combustion chamber, cylinder head and valve casing are practicallyr'of equal thickness, the motor may be run at a much higher cylinder temperature than would otherwise be practicable, and this temperature is not under normal conditions liable to be exceeded owing Yto theV property of metals radiating heat very much'faster at high temperature than at lovv, and also ovv'- ing to the fact that the amount of cooling air passed over the fins or ribs is varied in accordance with the fuel consumption of the motor.

It will also be noted that the cooling air is forced in by the fan at the top of the crank case which is thus effectively cooled. This is a feature of considerable practical importance as in some air cooled engines stem guide is surrounded by the cool incoming charge. This prevents the overheating and consequently very considerable empansion of the valve stem which aifects the time of opening and closing of the valve which inturn detrimentally affects the running of the engine.

What I claim as my invention is In an internal combustion motor the combination of a cylinder, a valve casing at the Vend of the cylinder provided with an exhaust expansion chamber, a plurality of thin ribs connected with the cylinder and the valve casing; and ribs in conductive connee tion 'With the inner surface of the bottomof the exhaust vexpansion chamber and the inner surface of the outer Wall thereof. n

2. ln an internal Ycombustion motor, the combination of a cylinder; a valve casing at the end of the cylinder provided With an exhaust Vexpansion chamber and a mixture inlet chamber side by side; valve stem guides each exposed to the interior of the inlet chamber; and a plurality of thin ribs eonnected with the cylinder a-ndjrthe valve casing. Y

3. Inan internal combustion motor, the combination of a cylinder; a valve casing at the end of the cylinder containing inlet and exhaust Vchambers having a common inner Wall; valve stem guidesV each exposed to the interior of the inlet chamber, the exhaust valve gui-de being formed in said common Wall; and a plurality of thin ribs connected with the cylinder and the valve easing.

4. In an internal combustion motor, the combination of a cylinder.; a valve casing at the end of the cylinder containing inlet Vand exhaust chambers VVhavingV a common inner Wall; valve stem guides each exposed to the interior of the inlet chamber, the exhaust valve guideVV being formed Vin said common Wall; and a plurality of thin longitudinal ribs connected with the exterior walls of the valve casing and cylinder.

Signed at lVindsor, Gntario, Canada, this 15th day of March, 1922.

VALTER CONNOR.

Witnesses YvoNNn HAMEL, Mann LYoNs. 

